"Gilles Tran" <gil### [at] agroparistechfr> wrote in message 
news:47e3c3cf$1@news.povray.org...

> 47e3be7f$1@news.povray.org...
>
>>      Ah well, that would explain why it hasn't been done yet, but I still 
>> think that with our great engineering brains, it 'might' be possible.
>
> As Gail said, not without breaking the laws of thermodynamics as we 
> understand them, so it would require a little more than engineering 
> brains.
> However, this never stopped people to create "perpetual" motion engines 
> that were always eventually proved to be either hoaxes/scams, or genuine 
> but not working, or working but not actually perpetual (i.e. requiring an 
> external energy source to work).

Yes, I've just done a little reading about PMM's and thermodynamics was 
mentioned quite a lot. I don't know, I can see that yes, there would be a 
problem with heat, but what about other materials? I know that PTFE is one 
of the slipperiest plastics out there, but then of course, you wouldn't have 
the strength.

  By the way, I think I remember on an old Tomorrows World program (late 
70's?) that an oil-less car engine had been produced, (still needed petrol 

per unit. I wonder what happened to that?

    ~Steve~



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